As a longtime Plex user, I've read good things about MrMC's playback abilities—especially with regard to HDR playback—so I picked up a Shield TV to test it out. Playback does indeed look quite good; however, there is a 1-2cm band along the entire right and bottom edge during video playback when using the Plex add-on within MrMC (see pic below). This occurs with both 1080p and 2160p content. The preplay screens fill the entire display; the problem only happens during playback. Video calibration appears to be correct in the MrMC settings, with the arrow fully visible in the bottom right corner of the display.

This issue is not present in the default Plex app for the Shield TV; when playing the same video files the picture goes to the right and bottom edges of the display. Does anyone have any idea what the problem might be? Any assistance would be greatly appreciated.

Unfortunately, playback in the MrMC Plex integration had the same outcome. Actually, the issue is different/worse than I originally believed. I went into the video calibration during playback and noticed it was not the same. After adjusting the calibration to bring the arrows back into the field of view there are black bars of unequal widths on all four sides. The bars are the same with either 1080p or 2160p content:

Top: 1.9cm

Bottom: 4.5cm

Left: 2.8cm

Right: 7cm

See images below:

1080p

2160p

Again, this does not happen when viewing the same content using the Plex app for the Shield TV. The video playback fills the screen with no overscan or underscan.